CODEWITHSUNDEEP
bashssh
mkrouse
mkrouse

Reputation: 277

Run a block of code after SSH connection Bash

After I ssh to a server, how do I run a block of code from my script remotely? Not sure if its possible.

ssh "$server"    #SSH login
echo Connected to "$serverName"
exec < filelist.txt
while read updatedfile oldfile; do
    # echo updatedfile = $updatedfile #use for troubleshooting
    # echo oldfile = $oldfile   #use for troubleshooting
    if [[ ! $updatedfile =~ [^[:space:]] ]] ; then  #empty line exception
        continue # empty line exception
    fi
    if [[ ! $oldfile =~ [^[:space:]] ]] ; then  #empty line exception
    continue # empty line exception
    fi 
    echo Comparing $updatedfile with $oldfile
    if diff "$updatedfile" "$oldfile" >/dev/null ; then
        echo The files compared are the same. No changes were made.
    else
        echo The files compared are different.
        cp -f -v $oldfile /infanass/dev/admin/backup/`uname -n`_${oldfile##*/}_$(date +%F-%T)
        cp -f -v $updatedfile $oldfile 
    fi  
done

Upvotes: 0

Views: 2082

Answers (1)

nullByteMe
nullByteMe

Reputation: 6391

You do it by using a here-document (untested below). Keep in mind that you will have to escape variables defined on the ssh server.

ssh $server <<ENDSSH 
echo Connected to "$serverName"
exec < filelist.txt
while read updatedfile oldfile; do
#   echo updatedfile = $updatedfile #use for troubleshooting
#   echo oldfile = $oldfile   #use for troubleshooting
           if [[ ! $updatedfile =~ [^[:space:]] ]] ; then  #empty line exception
            continue # empty line exception
           fi
           if [[ ! $oldfile =~ [^[:space:]] ]] ; then  #empty line exception
            continue # empty line exception
           fi 
        echo Comparing $updatedfile with $oldfile
        if diff "$updatedfile" "$oldfile" >/dev/null ; then
            echo The files compared are the same. No changes were made.
        else
            echo The files compared are different.
            cp -f -v $oldfile /infanass/dev/admin/backup/`uname -n`_${oldfile##*/}_$(date +%F-%T)
            cp -f -v $updatedfile $oldfile 
        fi          
done
ENDSSH

Upvotes: 2

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